[PD] GEM: writing an image different from the one displayed

[Matteo Sisti Sette]

Jack escribió:
> Can you try this patch (this is the IOhannes patch) with very small
> modifications.

It works fine now, even with jpeg (sending [file somefilename 95( )
As usual, tiffs are unreadable but i don't care since I want jpegs.

However I don't quite understand it: it uses pix_snap AND pix_write 
(without 'r'): isn't pix_write supposed to work without the need for a 
pix_snap?

And if I replace pix_write with pix_writer (in this last patch without 
any other change) it again does crash saving jpegs.....

I see you have changed the trigger order of pix_snap sending it first 
the bang and then the list, haven't you, but not on the pix_write...... 
is there a reason?

I think this solves my problem however I don't understand the whole picture


BY THE WAY one thing that I was missing in all my tests is that you have 
to explicitly set pix_snap 'window' (pos and size) to the size of the 
gemframebuffer (or gemwin); i would expect (am I the only one?) the 
default value to be the size of the framebuffer, but it isnt: it seems 
it is some fixed vaule. That should be documented. A lot of things 
should be documented...



> ++
> 
> Jack
> 
> 
> Le vendredi 27 novembre 2009 à 15:46 +0100, Matteo Sisti Sette a écrit :
>> I modified IOhannes' patch to use pix_write instead of 
>> pix_snap+pix_write and it also crashes, so it is not a difference 
>> between pix_write and pix_writer: both crash.
>>
>> I'll have a look at what's different between IOhannes' and Jack's 
>> patches that may explain why one crashes and the other does not....
>>
>>
>> Matteo Sisti Sette escribió:
>>> IOhannes m zmoelnig escribió:
>>>> Matteo Sisti Sette wrote:
>>>>> Ok, IOhannes' patch seems to be what I was looking for, however I have
>>>>> the following problems:
>>>>>
>>>>> - The patch out-of-the-box saves unreadable tiffs just like Jack's
>>>> which OS?
>>> Windows Vista :(
>>>
>>>
>>>>> - By sending it a [file something 95( to pix_writer in order to have
>>>>> jpegs saved instead of tiffs, which DOES work with [pix_write], pd
>>>>> crashes!!!!!
>>>> it's really the same object as [pix_write], just without the snap-code.
>>> Then the strange thing is that Jack's patch with pix_write does not 
>>> crash when saving jpegs (it saves black images but i guess it might be 
>>> some trivial error in the patch) while your patch with pix_writer 
>>> does.... How may I avoid the crash???
>>> It does not crash when I send the [file ...( message but when I try to 
>>> save the first snapshot after it.
>>>
>>>
>>> Where can I find some documentation more detailed than the help patches 
>>> in order to understand the mechanisms? I get quite lost when trying to 
>>> understand how your patch (for example) works. I more or less understand 
>>> the notion of gem chain, gem list, and, for example, separators, but I 
>>> still get lost when [gemframebuffer] enters the scene, I don't even 
>>> fully understand why it is needed at all in your patch, for example......
>>>
>>> Thanks again and again
>>>
>>


-- 
Matteo Sisti Sette
matteosistisette at gmail.com
http://www.matteosistisette.com